Integrated transcriptomics and metabolomics analyses reveal benzo[a] pyrene enhances the toxicity of mercury to the Manila clam, Ruditapes philippinarum

文献类型： 外文期刊

第一作者： Jiang, Weiwei

作者： Jiang, Weiwei;Fang, Jinghui;Du, Meirong;Gao, Yaping;Fang, Jianguang;Jiang, Zengjie;Fang, Jianguang;Jiang, Zengjie

作者机构：

关键词： Mercury; Benzo[a]pyrene; Ruditapes philippinarum; Toxicological responses; Transcriptomics; Metabolomics

期刊名称：ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY （ 影响因子：4.872； 五年影响因子：4.966 ）

ISSN： 0147-6513

年卷期： 2021 年 213 卷

页码：

收录情况： SCI

摘要： Mercury (Hg2+) and benzo[a]pyrene (BaP) are ubiquitous and persistent pollutants with multiple toxicities in bivalve molluscs. Here, the toxicological responses in the gills of Manila clams, Ruditapes philippinarum, to Hg2+ (10 mu g L-1), BaP (3 mu g L-1),and their mixture were analysed using transcriptomics and metabolomics approaches. Comparisons of the transcriptomes and metabolomes of Hg2+- and/or BaP-treated clams with control animals revealed the involvement of the detoxification metabolism, immune defence, energy-related pathways, and osmotic regulation in the stress response of R. philippinarum. Exposure to Hg2+ alone primarily enhanced the detoxification and energy metabolic pathways by significantly increasing the expression of genes associated with heat-shock proteins and oxidative phosphorylation. However, co-exposure to Hg2+ and BaP caused greater immunotoxicity and disrupted detoxification metabolism, the TCA cycle, glycolysis, and ATP generation. The expression levels of cytochrome P450 1A1 (CYP1A1), multidrug resistance-associated protein 1 (MRP1), and myosin (MYO), and the activity of electron transport system (ETS) in gills were detected, supporting the underlying toxic mechanisms of Hg2+ and BaP. We suggest that the presence of BaP enhances the toxicity of Hg2+ by 1) hampering the detoxification of Hg2+, 2) increasing the immunotoxicity of Hg2+, and 3) constraining energy availability for clams.

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